
import java.io.*; 

class ex_4_4 { 
	public static void main(String[] args)

	throws java.io.IOException { 

		int jumsu; 
		char hakjum; 
		String iput; 
		System.out.println("***** result *****"); 
		System.out.print("Input jumsu: "); 
		InputStreamReader kkk = new InputStreamReader(System.in);
		BufferedReader bbb = new BufferedReader(kkk); 
		iput = bbb.readLine();
		jumsu = Integer.parseInt(iput); 
		if (jumsu >= 90) 
			hakjum = 'A'; 
		else if (jumsu >= 80) 
			hakjum = 'B'; 
		else if (jumsu >= 70) 
			hakjum = 'C'; 
		else if (jumsu >= 60) 
			hakjum = 'D'; 
		else 
			hakjum = 'F'; 
		System.out.println("Hakjum: " + hakjum); 
	} 
} 
